P0948 Diagnostic Trouble Code

P0948 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P0948 diagnostic trouble code may include:

Faulty PCM
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Poor acceleration
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P0948 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0948.

Fortunately, P0948 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0948 Trouble Code For Specific Cars

P0948 Volkswagen 1200 RCNT Solenoid Circuit Malfunction
P0948 Dodge Charger Ignition Coil D Primary Circuit Malfunction
P0948 Bmw Touring Coast Clutch Solenoid Circuit Malfunction
P0948 Claveau Descartes Fuel Rail/System Pressure - Too Low
P0948 Alpine A442 Air Bag Passenger Circuit Resistance Low or Shorted Together
P0948 Rover 25 Ignition Coil - Cylinder 3 - Early Activation Fault
P0948 Chrysler Airflow Engine Oil Temperature Sensor Low